Just back from a spell in the IT wilderness. I see I have a couple of emails from you from ages back to answer. Sorry about that.
Anyway, these glasses of yours...
I have half a dozen of them packed away - almost identical, just a little straighter if my notes are right. Hold about 40cl, same optic ribbing, colour, flat cut rims, nice handles etc. They're pretty heavy, good quality, bright crystal.
Half were originally bought individually - rather than as a set - at the BAOR NAAFI in Schloss Neuhaus, near Paderborn in around 1980. The other three were from the Karstadt (I think) department store in Koeln a couple of years later.
Doesn't tell us who made them though.
They aren't really very green when they have beer in them. You can easily see the head through the glass. I don't ever recall anyone refusing a drink when handed one of these... :-)